Properties of Bionic Rubber Reinforced by Silica/carbon Black
Silica/carbon black(CB)mixed filler is one of the fastest-developing novel reinforcement agents for rubber materials in recent years,primarily employed to enhance the dynamic performance of rubber materials.In order to explore the influence of hybrid filler ratios and mixing processes on the dynamic and static mechanical properties of bionic rubber,two sets of experiments were designed:(1)with a fixed mixing time of 6 min,the bionic rubber was filled with silica/CB fillers at different mixing ratios,and a systematic study of properties,such as dispersion,tensile strength,fatigue and rolling resistance of the bionic rubber was conducted.The results show that when the mass fraction of silica in the fillers is less than approximately 50%,the tensile strength decreases with increasing the silica content,attributed to the decrease in the maximum cross-linking degree of molecular chains.However,with a further increase in silica content,the dispersion grade of vulcanizate increases from about 1 to about 9,leading to a reduction in filler agglomerate size and a significant increase in elongation at break and stretching fatigue life.(2)Under fixed mixing ratio conditions(mass fraction of silica in the fillers is 75%),the influence of mixing time on its dynamic and static mechanical properties was studied.The results show that within the studied mixing time range of 2-10 min,4 min mixing significantly increases tensile strength,300%modulus,and elongation at break,while reducing rolling resistance.This is mainly attributed to the larger maximum cross-linking degree of molecular chains and higher dispersion level and dispersion at this time.With a further increase in the mixing time(6-10 min),fillers in rubber tend to re-aggregate,leading to an increase in the mean agglomerate size and a decrease in dispersion,negatively impacting the dynamic and static properties of the rubber.
Bionic rubberSilicaCarbon blackDynamic and static mechanical property
万方数据
维普
